Apparatus for controlling electric motors.



No. 805,188. PATENTED NOV 21,

E. E1 HEY. I

APPARATUS FOR CONTROLLING ELECTRIC MOTORS. APPLICATION FILED HAY 5,1899.

385,138. PATENTED NOV. 21, 1905.

APPARA'E S F918 UQN'IRGLLING ELECTRIC MOTGRS. APPLIOATIOIT FILED MAY1899.

3 SHEETS-SHEET 2.

[jaw/z fan;

1550. $365,138 PATENTED NOV. 21, 1905.

H. B. DEY. APPARATUS .FQR SONTROLLING ELECTRIC MOTORS. APPMQATIOH FILED MAY 5. 1899.

3 SHEETS-SHEET 3.

friction-brake.

HARRY E. DEY, OF BROOKLYN, NEW YORK, ASSEGW n1 fur; 1T1

1k) instant in s. ESMOND, or NEW N. 1

APPARATUS FOR CONTROLLING. ELEQE'TREZZ MGTQRSEA Specification of Letters Patent;

Patented Nov. 1902;.

Application filed May 5, 1899= Serial No, 715,756.

To (all, whom, it may concern:

Be it known that I, HARRY E. Dar, a citizen of the United States, residing at New York city,borough of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Apparatus for Controlling Electric Motors, of which the fol.- lowing is a specification, reference being made to the accompanying drawings, wherein Figure 1 represents a motor controlled according to the fundamental principle of my invention. Figs. 2 and3 are diagrams representing different forms of the invention, and Figs. 4 and 5 represent the invention applied to an alternating-current motor.

My invention relates to a method of controlling the power and speed of an electric motor in which the armature and field-magnet have each a movement with relation to the stationary position of the other, which is ordinarily secured by permitting both the armature and the lield mag e to rotate. ileretofore it has been proposed to regulate motors of this type by connecting one element, either the holdmagnet or armature, to the load and adjusting the speed of the other element by means of a This method, however, obviously entails a decided loss by friction so long as the brake-control clement continues to rotate, while it also involves mechanical dillicultics in adjusting and regulating the pressure of the brake and in bringing the element to which the brake is applied to a standstili. instead of employing a friction-brake l attain similar results by a device which may be called an elcctrogenerative brake, since 1 apply the free-motor element (which term may be used to designate the element which not con: nectcd t0 the load) to drive an electric generator of any convenient type whose output may be regulated so as to impose a greater or less load on the-free-motorelement.

'lhe electr'omotivc force of the braking-gen erator may be utilized in any desired man ner. For example, it may work back upon the main line or it may supplement the controlled motor. In this manner a high degree of economy is insured.

The invention may alsdbe applied to an alternating-current motor, the braking cfieet being. produced by causing it' to generate a direct current which may be utilized in the ai ternating-currcnt motor by means of a commutator connected to the armature-winding, an in a rotary transformer. v

Referring tothe drawings, Fig. 1, A d e nates the machine to be controlied, and ii brahin'gmachine. The machine A. has its fieid magnet F journaied on the exterior of studs or bosses c c, proecting from the standards frame G and is geared to the iced L. Th mature D is journaled on bearings within studs 0 c. i

The current, as usuai, CiBlIV'QZGL to the held-magnet by means of collector-rings and to the armature by means of commutator--- brushes on the iieid-magnet, the details not beingillustrated, since they are familiar to the art, although fuily indicated in the diagram. M achine B has a stationary field-magnet, white its armature is on the same shaft with that of machine A it will be understood that-various equivalent arrangements may, be made giving the tandem ital efiFee-tof we connect ed armatures and Jo field-magnets---one rip-- eratinp; the load and the other stationary-- while it will also be understood that the ar rangemcnt may be reversed, the armature of machine A losing geared to the load and its field-magnet driving the rotary-element ma chine B, either the field-magnet or armature, or that the two free eiements may be concentric one'inside the other and the two embraced by the loaded and stationary elements.

The supply wires (i and H are connected by wires ,l and h: to the armature D and byshunt wires it and Sthe latter including" rheostat 'l---to the field-magnet F. In like manner wires L and M supply armature P, and shunt wires V and W the "old-magnet O, which is also regulated by the rheostat T.

in operation armature 1) wiil be constantly running and field-magnet F be made to rotate in the opposite direction at a variable speed.

Thus armature 1) might, for example, have a.

IO and convert machine A into a generator, dragging the loaded element" around in the opposite direction. speed of A is eighteen hundred running free in a given direction it will, in the mannerde scribed, bring the field magnet up to a speed of nine hundred in the opposite direction when acting as a motor. while its own speed drops to nine hundred also. On the other hand, if its speed increases from eighteen hundred to thirty-six hundred it will, as a generator, give the field-magnet a speed of nine hundred in I the same direction with itself. This is under .the assumption that the field-magnet of machine B alone is regulated; but if the field-- 5 magnet strength of machine A is also regulated reversely to that of B thesame speed variations may be secured by a much lower maximum speed of the armatures. This is particularly desirable where it is not required 3 to reverse machine A to full speed in the op posite direction, but simply give it a reversing tendency that will serve as a brake. In thismanner the machine A may not oniy be deprived of its rotating tendency, but given a tendency in the opposite direction, which will afford a frictionless braking action.

It will thus be evident that machine A when acting as 'a motor applies its torque partly to the load and partly to the regulatinggenera 4 .tor, and, moreover, that in driving its load the torque required therefor reacts upon the generatoras a counter torque, which in turn reacts upon its field-magnet as a stationary abutment, whereas in an ordinary motor the torque reacts upon its own stationary tield-magnet.

Whatl claim as new, and desire to secure by Letters Patent, is-- 1. The combination with adynamo-electric machine of the shunt type having both its 5 members rotatable, of driven mechanism connected to one member of said machine, a sec- 0nd dynamo-electricmachine, connected to the other member, said second machine being also of the shunt type and connected to the same constant-potential circuit with the first machine but in multiple therewith and a regulating resistance in the field-magnetcircuit of said second machine.

2. The combination with an electric motor 0 having bothof its members rotatable, or

drivenmcchanism connected to one member I and a generator connected to the other menu-- her and provided with a field-magnet coil in the armature-circuitof the motor.

3. The combination with an electric motor For example, if the armature having both of its men'ibers rotatable, of driven mechanism connected to one member and acompound generator connected to the other member with one lieldcnagnct coil in shunt and another magnet-coil in series with the motor-armature, the said coils supplementing each oth 4. The combination with an electric motor having both its members rotatable and provided with two held-magnet coils opposing each other, one in shunt and the other in series with its armature, or driven mechanism connected toonemotor element and ageneator connected to the other.

5. The combination with a motor having connected to the other member, both ma' chines being of the shunt type and adjustable resistance in the field-magnet circuit of both machines controllable to simultaneously in.- crease the current in one field-magnet and decrease that in the c'her.

6. The combination with a car-axle of motor having both of its members rotatable and adapted to receive both direct and alternating current, of line connections supplying the said motor with alternating currents and a generator driven by a car-axle and supplying the said motor with direct current.

7 The combination with a dynamo-electric machine of the shunt type having both its members rotatal le, o t driven mechanism connected to one member, a second dynamo-electric machine connected to the other member, the said second machine being also of the shunt type and connected to the same constantpotentiai circuit as the lirst machine, and an adjustable resistance in the field-magnet circuit of each machine respectiveiy.

8. The combination of mechanism to be driven of two dynamo-electric machines of the shunt type connected in multiple to the same constant-potential supply-circuit, one machine having both its members rotatable, one member being connected to the load and the other being connected to a member of the other machine and a regulating resistance in the lield-n1agnet circuit of one or both machines. i

9. The combination with a driven mechanism of an electric motor on a constant-potential supply-circuit having both its members rotatable, a dynamo of the shunt type driven by the said motor and also feeding the motor,

and a speed-regulator for the said mechanism compris ng an ad ustable rheostat 1n the field magnet circuit o'f'the generator aforesaid.

' 10. The combination withadrivenmechanism of an electric motor on a constant-potential suppiy-circuit having both its membefilrotatable, a generator of the shunt type, driven by the said motor and alsofeeding the motor, and a speed yegulator for the said mechanism comprising an adjustable resitmice in the field-megnet circuit ct bile dynamo efoi'eemcl ii. The combination with an electric r otor of the synchronoue eltei'netilug-current vpe, ii -a (lirectcurrent generator driven thei'ehy,

, mechanism also driven thereby end; 2?, speedi-egiilatoi' for the send mechenis "3 comprising an adjust-(thieresistance in the wcuit of the said generator.

12. The combination witli' elec" oi the synchronous eltemeting curi'ent type of a directcuwentgeneratoroftiie shunt tyne driven thereby, mechenisin elsodi-iven there:

by and e speed-regulate? E0 the mechanism comprising an ad uetnhl" resistance in the shunt field-magnet cinema or? the sni generat- J. nor.

The combination with an electric motor having its ermatmewi'nding connected to at specs tn en, with iii-aspect @XtBifIL-l ob ects ot' a driven other but 2L V'PLEJiiLblG speed ic moton iiicchenism and an electric genemtor both operated by the SitlCi motes, and uletor'forf the mechanism comprising means Em: 1' guleting the output of the sniii gener- 15. The combination with (lPlVGK! mecli" zinisrn of an ZEllZGXI'ittlDfi-(Z'PTGD'D motor supplied with current from at line and opci'z ing; the said mechanism a gcnei'etoi' also opei'; etc-d by motor and connections to! M:- taming the eneegy cleveloped by said generator to the en Minot/oi.

16. The combination with two shaft-e incclienically connected of it line-e .pplieclmotor driving one shaft and a generator intei'vcn--' ing between the said motel and the other shaft and supplying energy to the motor.

17. The combina'tion with two driven shafts mechanically connected oi dynamo-electric machine having one of its members mechzmicellgfconncctcd to one of said shafts and its other member rotatable and second dynamo- QlCClTslS inechinehiwing one of its inen'ilicrs connected to the rotary member of the first machine and its other member to the second shaft.

in Witness whereof l, line hereunto set my hand, before two subscribing WltllOlFSQf-L this: is; aley of May, 1899.

H A li lti" HEY 114 WWW 

